All-I and IPB video compression and other information.

Discussion in 'Amateur Video Production' started by Brian, Dec 17, 2013.

  1. Brian

    Brian Guest

    Thanks David.
    I would like to view the photo you have suggested thanks.
    My email address is the same one used in the newsgroup
    Could you let me know when you have sent it so I can look out for it as I
    often gets a lot of advertising e-mail.
    I won't pass it on to anyone as you've requested.
    Brian, Dec 22, 2013
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  2. I'm about to send it now (2,000mm-FL 35mm FF-equivalent
    David Ruether, Dec 22, 2013
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  3. Brian

    Brian Guest

    Received it thanks.
    Will have a good look at it later.
    Brian, Dec 22, 2013
  4. [...MUCH edited out - see above...;-]
    It's kinda fun to be able to shoot totally noiselessly, but I
    usually turn on just enough sound so I can hear when the shutter
    fires - but it is nice to feel no movement at all in the camera
    when the shutter fires...;-)
    All the Panasonics (in common with many other cameras) can
    shoot either JPG or RAW, or both at once - but I stick with
    JPGs (storing the larger-file RAW images would get to be a
    problem for me [I shot 30,000 frames this last year!]). As
    for aperture choice, I prefer to shoot at each lens'/FL's
    optimum stop for best image sharpness unless other reasons
    push me to move the chosen stop away from the optimum one.
    The optimum stop for a lens varies with sensor size, focal-
    length, how even center-to-corner sharpness is, sample
    quality, and the overall design quality of the chosen lens.
    For a generality, as a lens is stopped down, inherent
    problems with the optics are improved until increasing
    diffraction ill-effects begin to become more important
    than the continued improvement in the other imaging
    characteristics of the lens with stopping down toward
    smaller apertures. Almost all lenses reach peak sharpness
    in the image center before they reach peak sharpness in
    the image corners, so generally a compromise stop is
    needed for best overall results. The amount of this
    difference varies considerably with different lenses,
    but in general the difference is the least with good tele
    lenses, and the greatest with wide-angles - but there are
    many exceptions... For MFT, the optimum stop is often
    around f5.6, but it can be wider with some lenses, and my
    7-14mm is best in the corners at 7mm (but short of being
    equal to the center) at f9, and it can go to f13 at 14mm
    with still-good sharpness everywhere in the frame). Best
    to know the performance of your particular lenses at
    different stops (which can vary considerably with different
    samples of the same lens...) if you want to optimize
    image sharpness. (Oh, i forgot in the above to throw in the
    other "monkey-wrench": some lenses vary considerably with
    focus distance...)
    All cameras with electronic viewing-screens/eye-level-finders
    SHOULD be able to do this, but....;-)
    I set all my cameras to hold the taken image in both of the
    viewfinders until removed (by touching the shutter-release).
    David Ruether, Dec 22, 2013
  5. Brian

    Brian Guest

    If you find the RAW images too big to keep then you could create a Jpeg
    from the RAW image and just keep the jpeg. One advantage with
    a RAW image is that you can add the settings such as white balance after
    then create a Jpeg or create several Jpegs and keep the Jpeg that looks
    correct. RAW files use to take longer to save to the memory card but these
    days this is not a problem. I didn't realise that I had my camera set to
    take RAW photos until I looked at them on the computer.

    Brian, Dec 23, 2013
  6. Um, not with 30,000/year, most of which I keep...;-)
    I do this now, with JPG originals. I adjust the camera
    settings to give the best average results with JPGs,
    then work on these. Most characteristics can easily be
    modified in JPGs, and I can generally get results close
    enough to what I could get with RAW, without the bother
    of transferring/storing the MUCH larger RAW files in
    large quantities. Transferring 50-700 JPGs per day to
    five drives takes too long as it is...;-)
    David Ruether, Dec 23, 2013
  7. Brian

    Brian Guest

    Out of interest why do you take a lot of photos. Do you take many photos at
    different exposures or just take lots of photos of a subject from many
    different angles?

    Canon now has a RAW, RAW M AND RAW S as like you say people don't like
    large sized files.
    Brian, Dec 23, 2013
  8. I sometimes do take two different exposures, but that is
    not common for me; I do "explore" a subject"; I shoot 2-5
    frames of the same thing (they are all always slightly
    different from each other for sharpness and composition,
    and I like sharpness, and I prefer not to crop images); I
    see MANY things to shoot, EVERYWHERE I look, REGARDLESS
    of what is in front of the camera (I see *photographs*,
    NOT "records of particular things"). So, there are MANY
    things/ways to make photographs!;-)
    The Panasonics have long been able to shoot different
    qualities of RAW and JPG - but what is the point of
    shooting reduced-quality RAW images? Better to shoot
    highest-quality JPGs!
    David Ruether, Dec 23, 2013
  9. Brian

    Brian Guest

    After reading camera manuals and checking out the specs of different
    cameras I noticed that features were similar on most cameras. Its difficult
    to know which camera manufacture invented a certain feature first. Maybe
    Panasonic created the different RAW options first and Canon copied it to
    their cameras. Far as I know Nikon don't use different RAW options.
    Out of interest what is the video part of the Panasonic G5 like. Is there
    motor noise when the camera focuses during the recording of a video. Are
    there different video options for the video bit rate? Does it use the MOV
    video format? Can you make adjustments when recording a video? Do you have
    adjustable options such as the aperture just before you start to record
    video? Can you take still photos when you are recording in video?
    I noticed a lean towards making dSLR cameras better for recording videos.
    Brian, Dec 24, 2013
  10. :

    There are some basic technical differences between DSLRs (with mirrors)
    and mirrorless cameras that favor the latter for video. Also, as the
    pixel-count race advances (with some advantages for stills...), video
    can get worse (one of the best cameras for stills, the 36-megapixel
    Nikon D800, is also one of the worst for shooting video...).
    It is one of the best available in terms of image quality, and is
    often relatively very cheap. The video from the Panasonic G6 and GX7
    is similarly good. The video from the GH3 is somewhat different (and
    the GH3 is more "pro" oriented). All four cameras have slightly (or
    more than slightly, in the case of the GH3), feature-sets for video.
    For something really interesting for video (but likely MUCH more
    expensive), watch for the next GH model...;-). Right now, the
    "bargain" camera for video is likely the G6 with its kit lens...
    No, except with the 20mm f1.7 Panasonic lens. All the others are
    The GH3 can; the G5/6 can't; I don't remember about the GX7...
    For Panasonic body specifications and video samples:
    (click on each camera model, and when you get to the end of each
    page, click on "NEXT" for more...).
    For Panasonic lens information and samples:

    There are also MANY "3rd-party" lenses available, and some of
    these are quite good. Also, there are "specialty" lenses
    available, like f0.95 lenses, a perspective-control lens I
    hope to get soon, unusually tiny lenses, VERY long effective
    FL lenses, plus almost any lens made for almost any brand camera
    can be adapted to mirrorless cameras (although not all work well,
    and all are manual-control only...). BTW, the two Panasonic
    "power-zoom" lenses (plus some others) have a new stabilizer
    that permits hand-held shooting of stills at absurdly slow
    shutter speeds.
    Yes. This is easier with mirrorless cameras than with DSLRs.
    Yes, and during, too. There are lenses available for the format
    that have "clickless" aperture rings, and also ones with standard
    "gears" for accessory aperture and focus controllers. Most now
    have rear-screen touch focus at any time, and anywhere within the
    frame, nice for video...
    I think so, at least with some, but this is not interesting to
    Yes, but there are inherent limitations such as with a moving mirror,
    you lose the eyelevel VF during shooting video with DSLRs, but not
    with the mirrorless cameras that have eyelevel viewfinders. There
    are other operational differences that favor mirrorless, too...
    David Ruether, Dec 24, 2013
  11. Brian

    Brian Guest

    Thanks for the info David.
    I hope you received my e-mail in reply to the sample photos you e-mailed to
    Merry Christmas.
    Brian, Dec 24, 2013
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